m1*V1+m2*V2=(m1+m2)*U V1=((m1+m2)*U-m2*V2)/m1=((2+3)*12-3*10)/2=15 м/с
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m1*V1+m2*V2=(m1+m2)*U V1=((m1+m2)*U-m2*V2)/m1=((2+3)*12-3*10)/2=15 м/с